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Old 01-09-2011, 12:55 PM   #1
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Vapour sealing an electrical box


In order to save drywall work, i cut a hole in the drywall big enough to slip in an electrical box for a switch. How do i re-seal the vapour barrier???

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Old 01-09-2011, 04:05 PM   #2
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Vapour sealing an electrical box


you are going to have to remove the box and add a vapor barrier box and then tape that in

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Old 01-09-2011, 04:56 PM   #3
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Vapour sealing an electrical box


Yes I have the vapour barrier plastic boxes (should have mentioned that). But how to tape in? I am working only from the front in a hole no bigger than the box.
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Old 01-10-2011, 06:30 AM   #4
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Vapour sealing an electrical box


just tape that box to the vapor barrier
or whats the problem you cant get to it? then your going to have to cut some drywall back and tape it
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Old 01-10-2011, 05:30 PM   #5
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Vapour sealing an electrical box


Yes, its too hard to work from the front in a small hole. And I don't want to open any more drywall (hate doing drywall patching). So my new plan is to use silicon. Push the plastic box cover into the hole, push it back, put a bead of silicon around the flaps and then pull back to make contact with the vapour barrier. Can't think of any other way to do this.
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Old 01-10-2011, 07:18 PM   #6
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Vapour sealing an electrical box


Acoustical sealant will give a much better and more permanent seal than silicone caulk.Caulking doesn't adhere well to poly. Just be careful with the sealant nozzle, that black stuff is nearly impossible to remove from where you don't want it.
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Old 01-11-2011, 02:31 AM   #7
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Vapour sealing an electrical box


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Originally Posted by daveb1 View Post
Acoustical sealant will give a much better and more permanent seal than silicone caulk.Caulking doesn't adhere well to poly. Just be careful with the sealant nozzle, that black stuff is nearly impossible to remove from where you don't want it.
We call it black death.

If you get it anywhere it's not supposed to be, you're dead.
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Old 01-11-2011, 06:48 PM   #8
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Vapour sealing an electrical box


Thanks everyone. OK, I admit it. It was impossible to do and the "black death" comment really motivates me! I finally bit the bullet and cut back the drywall. Everything is in and properly done and was easy to do. No silicon or stupid shortcuts used.

But sadly, now I have to drywall and paint. I REALLY hate doing that. Makes such a mess.

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Old 01-11-2011, 07:28 PM   #9
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Vapour sealing an electrical box


I find the black death comes off your hands if you have greasy pizza for lunch.
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Old 01-11-2011, 07:32 PM   #10
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Vapour sealing an electrical box


Sometimes I call greasy pizza black death if you know what I mean.
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Old 01-12-2011, 03:14 AM   #11
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Vapour sealing an electrical box


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Thanks everyone. OK, I admit it. It was impossible to do and the "black death" comment really motivates me! I finally bit the bullet and cut back the drywall. Everything is in and properly done and was easy to do. No silicon or stupid shortcuts used.

But sadly, now I have to drywall and paint. I REALLY hate doing that. Makes such a mess.

At least you can feel proud that it's done proper.

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